Klaro! Simple and user-friendly consent manager.

Klaro is a free & open-source tool that provides an intuitive, user-friendly and compliant way to manage consent on your website. Klaro is easy to use and configure, lightweight and compatible with all modern browsers.

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Simple & User-Friendly

Klaro is simple, unobtrusive and optimized for mobile as well as desktop browsers. It tries to stay out of the way while helping you to be fully transparent and compliant.

Open Source

Klaro is licensed under a permissive BSD-3 license, which means that you can use it freely for commercial and non-commercial purposes. No hidden fees or restrictions.

Easy to Customize

Klaro can manage both inline and external scripts as well as static tracking elements like images or stylesheet links. New apps can be added with just a few lines of code.

More features

  • Privacy by design & default: Klaro supports implicit and explicit (our favorite!) modes of consent and can make sure that no third-party apps are loaded without the consent of the user.
  • Smart change detection: Klaro automatically detects config changes and will renew consent whenever you add a new app for which the user didn't give consent yet.
  • Multilingual: Klaro has full support for internationalization and makes it easy to add or modify translations with just a few lines of code: Example in
  • Mobile-friendly and compatible with all modern browsers: Klaro works with all major browsers and is optimized for both desktop and mobile clients.
  • Lightweight & fast: Klaro.js is less than 20 kB of Javascript (minified + gzipped) and is lightning-fast so that your users won't notice any difference when using it.
  • Easy to customize: Klaro lets you change the stylesheet to better match your own design and lets you access its functionality via Javascript as well.

Getting Started

Setting up Klaro on your website is easy and usually takes less than 10 minutes. All you need to do is write a small config file, load the klaro.js script and make a few small changes to your third-party/tracking scripts on your page so that Klaro can manage them. Let's get started!

Write the config file (no worries, it's easy)

window.consentConfig = {
    privacyPolicy: '/privacy.html',
    apps : [
        {
            name : 'google-analytics',
            default: true,
            title : 'Google Analytics',
            purposes : ['statistics'],
            cookies : [/^ga/i],
            callback : function(consent, app){
                //this is an example callback function...
            },
        },
        //...
    ],
}

First, you need to tell Klaro about the third-party apps and trackers on your site. To do this you write a simple Javascript config. The easiest way to get started is by looking at the annotated config file used for this site and simply modify it according to your needs. No rocket science involved, promised. There are some more examples on Github as well.

View example config

Stay tuned: We're working on an online configuration editor that will allow you to edit and download a config file without writing a single line of code!

Modify your third-party/tracking scripts (just a little bit)

# Inline scripts:
<script type="opt-in"
        data-type="application/javascript"
        data-name="google-analytics">
//...
</script>

# External scripts and resources (img, link, ...):
<script type="opt-in"
        data-src="https://analytics.7scientists.com/matomo.js"
        data-name="matomo">
</script>

To make sure that no tracking scripts and third-party apps are loaded without consent, you need to modify your HTML code a tiny bit: For inline scripts, replace the value of the type attribute with opt-in (this keeps the browser from executing the script) and add a data attribute with the original type, e.g. data-type="application/javascript". Also add a data-name attribute that matches the name of the given app in your config, e.g. data-name="googleAnalytics".

For external script do the same, but in addition rename the src attribute to data-src (this ensures that the browser won't load the script without the consent of the user). This also works for other tags such as images/tracking pixels. Just remember to always add a data-name attribute that matches the name of the app in your config so that Klaro knows which element belongs to which app.

Load the config and the script (last step, promised)

<script defer type="application/javascript"
        src="config.js"></script>
<script defer type="application/javascript"
        src="klaro.js"></script>

Finally, include both the config script as well as the Klaro code on your page. You can defer the loading of the scripts if you like, just make sure the config is initialized when Klaro loads. You can have a look at our simple example page to get an idea of how to do this.

Download klaro.js ()


Advanced Configuration

  • Customizing texts and translations: You can overwrite default translations and add your own if you like. As an example, check out this config file.
  • Opening Klaro via a link: To allow you users to review and customize their consent decisions, you will need to let them open the Klaro manager on demand. You can do this by calling the show function of the Klaro library, e.g. like this: <a onClick="klaro.show();return false;">manage your consents</a>.
  • Accessing the consent manager: You can access the consent manager via Javascript by using the klaro.getManager(config) function. Please not that currently the manager class does not notify the user interface of changes (yet), so make sure to call klaro.show(config) to update the UI after making changes to the consent configuration.
  • Managing cookies: Klaro can automatically delete third-party cookies for you when the user withdraws consent. To make use of this, simply define a cookies entry in the app config, e.g. like this: 'cookies' : ['_ga', '_gid', '_gat', /^_gac_.*$/i]. You can also use regular expressions.
  • Custom callbacks: You can define custom callbacks for your applications that will be called with the given consent state (true if consent was given, false if not). They will be called when Klaro is loaded as well as each time the user updates the consent choices. This allows you to perform more advanced management tasks such as calling API endpoints to remove data.
  • Custom styling: If you want to build your own stylesheet for Klaro, you can set the style-prefix data attribute of the script tag loading the library to customize the class of the main DIV element of Klaro's UI, e.g. like this: <script src="klaro.js" data-style-prefix="my-styles"></script> This will assign the class my-styles class to Klaro's main DIV element and disable all default styles.
Legal disclaimer: By using Klaro you agree that we (the Klaro authors) cannot be held responsible or liable for any damages resulting from the use of the software. Please note that we cannot guarantee that Klaro is bug-free (although we try our best) and suitable for your use case, so please be careful when using it. Finally, we cannot cannot provide any warranty or support beyond our voluntary help.

Questions?

Do you have questions or problems? Then just head over to our Github page and feel free to open an issue. If you want to contribute to Klaro, feel free to open a pull request (but better ask us for advice before you make large changes). You can also reach us by e-mail at [email protected]. We're looking forward to hear from you!

By the way, Klaro is pronounced [klɛro] and is a colloquial German word that means "alright" or "got it".

Privacy Policy

This website is a project by DPKit & KIProtect (KIProtect is the responsible data controller). We use third-party applications and cookies on this site for analytics, demonstration purposes and security. You can review your consents for these here. You have the following rights regarding your personal data: Erasure, rectification, access / download, portability, restriction of processing and filing a complaint at a responsible data protection agency.

You can reach us at [email protected] if you have any questions regarding this website or your personal data.